diff --git a/flake.nix b/flake.nix
index 138422f..a5ff1b9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -76,7 +76,7 @@
               inherit pkgs;
               buildRustCrateForPkgs = customBuildInfo;
               rootFeatures = [ "screenplay" ];
-              release = false;
+              release = true;
             }).rootCrate.build;
           };
     };
diff --git a/kifu/kifu-gtk/src/main.rs b/kifu/kifu-gtk/src/main.rs
index 0a7e41c..d1ce77d 100644
--- a/kifu/kifu-gtk/src/main.rs
+++ b/kifu/kifu-gtk/src/main.rs
@@ -3,7 +3,7 @@ use gtk::prelude::*;
 use kifu_core::{CoreApp, Request, Response};
 use kifu_gtk::{ui::PlayingField, CoreApi};
 use std::{
-    sync::{Arc, Mutex},
+    sync::{Arc, Mutex, RwLock},
     time::Duration,
 };
 use tokio::{
@@ -52,12 +52,23 @@ fn main() {
 
             gtk_rx.attach(None, {
                 let api = api.clone();
+                let playing_field = Arc::new(RwLock::new(None));
                 move |message| {
                     match message {
                         Response::PlayingFieldView(view) => {
                             let api = api.clone();
-                            let playing_field = PlayingField::new(api, view);
-                            window.set_child(Some(&playing_field));
+
+                            let start = std::time::Instant::now();
+                            let mut playing_field = playing_field.write().unwrap();
+                            if playing_field.is_none() {
+                                let field = PlayingField::new(api, view);
+                                window.set_child(Some(&field));
+                                *playing_field = Some(field);
+                            } else {
+                                playing_field.as_ref().map(|field| field.update_view(view));
+                            }
+                            let end = std::time::Instant::now();
+                            println!("Time to render the playing field: {:?}", end - start);
                         }
                     }
                     Continue(true)
diff --git a/kifu/kifu-gtk/src/ui/board.rs b/kifu/kifu-gtk/src/ui/board.rs
index 6024b42..de9b561 100644
--- a/kifu/kifu-gtk/src/ui/board.rs
+++ b/kifu/kifu-gtk/src/ui/board.rs
@@ -82,6 +82,7 @@ impl ObjectImpl for BoardPrivate {
 
         self.drawing_area
             .set_draw_func(move |_, context, width, height| {
+                let render_start = std::time::Instant::now();
                 let board = board.borrow();
                 match background {
                     Ok(Some(ref background)) => {
@@ -125,11 +126,10 @@ impl ObjectImpl for BoardPrivate {
                 (0..19).for_each(|col| {
                     (0..19).for_each(|row| {
                         match board.stone(row, col) {
-                            IntersectionElement::Unplayable => {}
-                            IntersectionElement::Empty(request) => {}
                             IntersectionElement::Filled(stone) => {
                                 pen.stone(&context, row, col, stone.color);
                             }
+                            _ => {}
                         };
                     })
                 });
@@ -144,6 +144,8 @@ impl ObjectImpl for BoardPrivate {
                     ),
                     _ => {}
                 }
+                let render_end = std::time::Instant::now();
+                println!("board rendering time: {:?}", render_end - render_start);
             });
 
         let motion_controller = gtk::EventControllerMotion::new();
diff --git a/kifu/kifu-gtk/src/ui/playing_field.rs b/kifu/kifu-gtk/src/ui/playing_field.rs
index b4fa490..1738cf3 100644
--- a/kifu/kifu-gtk/src/ui/playing_field.rs
+++ b/kifu/kifu-gtk/src/ui/playing_field.rs
@@ -85,6 +85,13 @@ impl PlayingField {
 
         s
     }
+
+    pub fn update_view(&self, view: PlayingFieldView) {
+        self.imp().board.borrow().as_ref().map(|board| {
+            board.set_board(view.board);
+            board.set_current_player(view.current_player);
+        });
+    }
 }
 
 #[cfg(feature = "screenplay")]